Android 菜单Menu

通过XML布局文件实现菜单项的添加

注意，布局文件是放置在res/menu下的，所以要新建一个menu文件夹

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/about" android:title="ABOUT" /> <item android:id="@+id/exit" android:title="EXIT" /> </menu> Activity如下
package com.zeph.android; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; public class Android4_2_11Activity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub int item_id = item.getItemId(); switch(item_id){ case R.id.about: Intent intent = new Intent(); intent.setClass(Android4_2_11Activity.this, Activity02.class); startActivity(intent); Android4_2_11Activity.this.finish(); break; case R.id.exit: Android4_2_11Activity.this.finish(); break; } return super.onOptionsItemSelected(item); } }package com.zeph.android; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class Activity02 extends Activity{ TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity02); textView = (TextView)findViewById(R.id.TextView1); } }

注意：使用Intent跳转时，首先要在AndroidManifest.xml里将，Activity02进行注册，才能使用。

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.zeph.android" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="4" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Android4_2_11Activity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="Activity02"></activity> </application> </manifest>